Single hook



FIG. 1 is a front perspective view of a single hook embodying our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevation view thereof. The side opposite to that depicted in FIG. 4 is identical in appearance;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a single hook, as shown and described. 